KR100686145B1 - Method for controlling drum type wahing machine for dewatering the laundry - Google Patents

Abstract

A dehydration control method of a drum type washing machine is provided to obtain more accurate eccentric information by considering eccentricity caused from laundry in a drum, and eccentricity generated according as liquid flows in a liquid balancer. A dehydration control method of a drum type washing machine comprises: a first eccentricity measuring step(S110) of measuring eccentric rate of laundry in a drum while rotating the drum at a first rotation velocity; a first acceleration step(S150) of accelerating rotation velocity of the drum to equally distribute a liquid balancer installed in the drum; a second eccentricity measuring step(S160) of measuring eccentric rate according to the distribution of liquid filled in the liquid balancer and laundry in the drum while rotating the drum at a second rotation velocity; a second acceleration step(S180) of accelerating the rotation velocity of the drum to dehydrate; and a regular dehydration step(S190) of dewatering laundry by rotating the drum at predetermined rotation velocity.

Description

Method for controlling drum type wahing machine for dewatering the laundry

1 is a flowchart illustrating a dehydration control method of a conventional drum washing machine.

2 is a schematic configuration diagram of a drum washing machine to which the dehydration control method of the drum washing machine according to the present invention is applied.

3 is a cross-sectional view of the liquid balancer cut along the circumferential direction

4 is a flowchart illustrating a dehydration control method of the drum washing machine according to the present invention.

Figure 5 is a graph showing the rotational speed of the drum changes over time

6 is a flowchart illustrating a dehydration control method of a drum washing machine according to another embodiment.

** Description of symbols for the main parts of the drawing **

10: case 20: tub

30: drum 40: motor

50: liquid balancer S100: inflated step

S110: first eccentric measurement step S150: first acceleration step

S160: second eccentric measurement step S180: second acceleration step

S190: normal dehydration stage

The present invention relates to a method for controlling dehydration of a drum washing machine, and more particularly, to a method for controlling dehydration of a drum washing machine, which can reduce vibration and noise by preventing eccentricity of liquid balancer and avoiding resonance zone.

In general, after washing the laundry into a cylindrical drum, washing water and detergent are supplied, the drum washing machine performs washing by using friction between the laundry and the drop of the laundry and the washing water due to the rotation of the drum. The washing of the laundry is completed through a series of strokes such as rinsing, dehydration and drying.

Here, the dehydration stroke is a process of separating the water from the laundry by strong centrifugal force while the drum rotates at a high speed after washing and rinsing.

In other words, when the washing and rinsing process is completed, the drum washing machine rotates the drum quickly so that dehydration is performed from the laundry. The laundry is deviated to one side by tangling the laundry during the washing and rinsing process. This causes heavy eccentricity on one side.

This eccentricity causes severe vibration in the drum during dehydration, so that a device for maintaining the rotational balance of the drum is installed to reduce the vibration, which is called a balancer.

Counterweight for drum washing machine has been used to counterbalance eccentricity by attaching additional mass, but in recent years, it has formed a ring-shaped space with a predetermined width in the circumferential direction on the front or rear of the drum. The liquid balancer which is filled with the liquid and sealed completely by heat fusion is mainly used.

The centrifugal force, the rotational inertia generated by the drum's rotation, is biased by the eccentricity of the laundry inside the drum. The bias is compensated for by positioning the liquid inside the liquid balancer to the opposite side of the eccentric. Done.

As described above, by the liquid balancer to correct the eccentricity in the drum, the vibration is reduced during rotation of the drum, it is to achieve a stable dehydration.

Looking at the dehydration control method of the conventional drum washing machine with reference to FIG.

First, the dehydration stroke of the drum washing machine starts from the inflating step (S10) of untangling the laundry inside the drum.

The inflating step (S10) is to solve the tangling of the laundry by rotating the drum several times at a predetermined rotation speed for a predetermined time in the forward or reverse direction.

Then, after the rotational speed of the drum is accelerated to a certain speed and the constant speed is maintained, the tangled laundry is distributed evenly on the drum, and in this process, the amount of eccentricity of the laundry inside the drum is measured (S20).

Here, if the measured amount of eccentricity is smaller than the set reference eccentricity, the process proceeds to the next step, and if it is large, the process returns to the inflating step (S10) and goes through the determination step (S30) to perform the inflating again.

If the measured eccentricity is less than the reference eccentricity, the drum is accelerated to a predetermined speed for dehydration (S40), and dehydration is performed at the speed (S50).

On the other hand, since the drum washing machine inevitably passes through the resonance section in the dehydration process as described above, in order to avoid this, the drum washing machine rapidly accelerates the rotation speed of the drum.

For example, in the case of a 10 kg drum washing machine, although the eccentricity is determined to be small when checking the eccentricity at about 100 RPM (Revolution Per Minute), the eccentricity is greatly increased in the resonance section of about 170 RPM to 250 RPM, resulting in a lot of vibration and noise. This can happen.

As a result, in order to pass through the above resonant band quickly.

However, the dehydration control method of the conventional drum washing machine does not include a process of evenly dispersing the liquid collected in the lower portion of the liquid balancer at the start of the dehydration stroke.

Therefore, the liquid filled in the liquid balancer may be the case that the liquid is driven to any one side of the drum while going through the inflating step (S10) that is repeatedly performed to eliminate the tangling of the laundry.

Then, if the dehydration stroke proceeds to the acceleration step (S40) in a state in which the liquid is driven on one side, there is a problem that the vibration due to the eccentricity of the liquid balancer lasts for a long time.

In addition, even when the eccentricity of the liquid balancer does not occur in the inflating step (S10), when the rapid acceleration in the acceleration step (S40), the liquid of the liquid balancer is biased to one side due to the large acceleration before the balancing function, rather the eccentricity Increasing problems may arise.

The present invention has been made to overcome the problems of the prior art, and an object of the present invention is to provide a dehydration control method of a drum washing machine that can reduce vibration and noise by preventing the eccentricity of the liquid balancer and avoiding the resonance zone. .

Dehydration control method of the drum washing machine according to the present invention for achieving the above object is a first eccentric measurement step of measuring the eccentricity of the laundry in the drum while rotating the drum at a first rotational speed, and is installed in the drum A first acceleration step of accelerating the rotational speed of the drum to distribute the liquid balance evenly, and the distribution of the laundry inside the drum and the liquid filled inside the liquid balancer while rotating the drum at a second rotational speed A second eccentric measurement step of measuring the amount of eccentricity, a second acceleration step of accelerating the rotational speed of the drum for dehydration, and a normal dehydration step of performing the dehydration of the laundry while rotating the drum at a predetermined rotational speed. Is done.

Here, before the first eccentric measurement step, it may be made by further comprising a step of unfolding the tangled laundry.

Between the first eccentricity measuring step and the first acceleration step, determining whether to move to the first acceleration step or to return to the inflating step according to the magnitude of the eccentricity measured in the first eccentricity measuring step It may further comprise a determination step.

Meanwhile, in the first acceleration step, the rotation speed of the drum is accelerated up to the second rotation speed, wherein the second rotation speed is smaller than the rotation speed of the drum when resonance occurs in the drum washing machine.

In addition, the rotational acceleration of the drum in the second acceleration step is preferably greater than the rotational acceleration of the first acceleration step.

Between the second eccentricity measuring step and the second acceleration step, determining whether to move to the second acceleration step or return to the inflating step according to the magnitude of the eccentricity measured in the second eccentricity measuring step The second judging step may be further included.

In addition, a position correction step of correcting the position of the eccentric laundry between the first determination step and the first acceleration step may be further included, in this case, between the second eccentric measurement step and the second acceleration step, The second determination step may include determining whether to move to the second acceleration step or return to the position correction step according to the size of the eccentricity measured in the eccentric measurement step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art. Like numbers refer to like elements throughout.

2 is a schematic configuration diagram of a drum washing machine to which the dehydration control method of the drum washing machine according to the present invention is applied.

Referring to FIG. 2, the drum washing machine includes a case 10 forming an exterior, a tub 20 installed in the case 10 and receiving wash water, and a cylindrical shape rotatably installed in the tub 20. The drum 30 is installed on the rear side of the tub 20 and is made of a large motor 40 for generating a rotational force by receiving power.

The door 12 is installed at the center of the front of the case 10 so that laundry can be put into the drum 30 and taken out. The door 12 is hinged to the case 10 to open and close.

A hanging spring 22 through which the tub 20 is suspended is installed between an upper side of the outer peripheral surface of the tub 20 and an inner side of the upper surface of the case 10, and a lower side of the outer peripheral surface of the tub 20 and the case 10. The damper 24 is provided between the lower surfaces to damp the vibration of the tub 20 generated during dehydration.

A gasket 26 is provided between the door 12 and the tub 20 to prevent the leakage of the wash water, thereby maintaining airtightness.

On the inner circumferential surface of the drum 30, lifts 32 are formed at regular intervals along the circumferential direction to agitate laundry and washing water.

In addition, the motor 40 is composed of a stator 42 fixed to the rear of the tub 20 and a rotor 44 installed outside the stator 42, and the drum shaft 46 includes the rotor 44. And the drum 30 is directly connected to transmit the rotational force to the drum 30.

On the other hand, the front surface of the drum 30 is formed in a ring-shaped in the circumferential direction is filled with salt water in the inside having a predetermined width and is provided with a liquid balancer 50 completely sealed by heat fusion.

3 is a cross-sectional view of the liquid balancer cut along the circumferential direction.

Referring to FIG. 3, a plurality of partitions 52 are installed in the liquid balancer 50 so as to partition the space inside the body of the liquid balancer 50 at regular intervals along the radial direction and form concentric circles with the outer circumferential surface.

Each space partitioned by the partition wall 52 is filled with a certain amount of liquid 54 which serves as a balancing function, and the liquid 54 may be brine.

A first baffle 56 and a second baffle 57 are radially attached to the inner circumferential surface of the outer portion of the body of the liquid balancer 50 and the inner circumferential surfaces of the partitions 52 and have a predetermined height in the inward direction.

Specifically, the first baffle 56 and the second baffle 57 maintain a predetermined distance and are alternately installed, and disposed radially. The first baffle 56 has a height that is 70 percent of the gap between the partition walls 52, and the second baffle 57 has a height that is 50 percent of the height of the first baffle 56. It is provided.

The first baffle 56 serves to distribute the liquid 54 well in the circumferential direction of the liquid balancer 50 by centrifugal force when the drum 30 rotates, and the second baffle 57 The first baffle 56 serves to suppress the vibration of the liquid 4 by suppressing the shaking.

Hereinafter, the dehydration control method of the drum washing machine according to the present invention applied to the drum washing machine configured as described above will be described in detail.

4 is a flowchart illustrating a dehydration control method of a drum washing machine according to the present invention, and FIG. 5 is a graph illustrating a rotation speed of a drum that changes with time.

4 and 5, the dehydration control method of the drum washing machine according to the present invention is a method for measuring the eccentricity of the laundry in the drum 30 while rotating the drum 30 at a first rotational speed (w2) The first eccentric step (S110), the first acceleration step (S150) for accelerating the rotational speed of the drum 30 to evenly distribute the liquid balancer 50 installed in the drum 30, and the drum ( The second eccentric measurement step (S160) for measuring the eccentricity according to the distribution of the laundry and the liquid balancer 50 inside the drum 30 while rotating 30 at a second rotational speed (w3), for dehydration It includes a second acceleration step (S180) for accelerating the rotational speed of the drum 30, and a normal dehydration step (S190) for performing the dehydration of the laundry while rotating the drum 30 at a predetermined rotational speed.

When the drum washing machine finishes the washing and rinsing stroke, it enters the dehydration stroke. Before performing the first eccentric measuring step (S110), first, the foaming step of releasing the laundry tangled in the washing stroke and the rinsing stroke (S100). ).

The inflating step (S100) is a process of driving the motor 40 at a predetermined rotation speed w1 for a predetermined time t1 in the forward or reverse direction, and then rotating the motor 40 several times in the same or opposite direction as the rotation direction. By the process of accelerating and decelerating the rotational speed of the drum 30 through the inflating step (S100), the tangling of the laundry is released.

Then, the drum washing machine measures the first eccentricity inside the drum 30 while the drum 30 is accelerated to the first rotational speed w2 and then maintained at a constant time t2. The measurement step S110 is performed.

In the first eccentric measurement step (S110), the drum 30 is maintained at a first rotational speed (w2), for example, at a predetermined time (t2) at about 100 RPM, thereby eliminating tangling through the inflating step (S100). A balancing process for evenly distributing the laundry into the drum 30 is also performed.

Here, the measurement of the first measurement amount of eccentricity is performed by detecting an amount of change in RPM of the motor 40 by a Hall sensor (not shown) provided in the motor 40.

Then, the controller (not shown) of the drum washing machine performs a first determination step (S120) of comparing the first measurement of the eccentricity measured in the first eccentricity measuring step (S110) with a preset first reference eccentricity.

That is, when the first measurement amount of eccentricity is smaller than the first reference eccentricity, the process proceeds to the first acceleration step S150. When the first measurement amount of eccentricity is larger than the first reference eccentricity, the folding step ( Return to S100) and repeat the above process.

On the other hand, before the first acceleration step (S150), before the position correction step (S130) for correcting the position of the laundry may be performed.

The position correction step (S130) measures the vibration displacement of the drum 30 while rotating the drum 30 several times at a speed lower than the first rotation speed (w2), when the vibration displacement is less than a predetermined size Until the abdomen is performed.

Here, the measurement of vibration displacement may be made by a vibration measuring sensor (not shown) installed on one side of the tub 20 to measure the vibration displacement, an acceleration sensor or the like is used as the vibration measuring sensor (not shown). .

The drum 30 stopped at the end of the position correction step S130 is once accelerated to the first rotation speed w2. The first acceleration step S150 is prepared while the balancing step S140 is performed again while maintaining the first rotation speed w2 at a predetermined time t3.

Then, after the predetermined time t3, the drum washing machine increases the first washing machine to uniformly distribute the liquid balancer 50 without increasing the rotational speed of the drum 30 without decelerating the rotational speed. Step S150 is performed.

On the other hand, when the drum 30 is in a stopped state or at a low rotational speed, the liquid 54 inside the liquid balancer 50 as a whole is accumulated under the liquid balancer 50 by gravity.

Then, when the rotational speed is increased to generate the centrifugal force that overcomes the gravity of the liquid 54, the centrifugal force gradually moves upward along the circumferential direction of the liquid balancer 50, and the partition 52 inside the liquid balancer 50. The liquid 54 is distributed at a height lower than that of the first baffle 56 for each independent space formed by the space.

At this time, when the laundry inside the drum 30 is biased due to the bias to one side, the liquid 54 corrects the eccentricity while moving again to be symmetrical with the biased side by the amount of the eccentricity.

Meanwhile, in the first acceleration step S150, the rotation speed of the drum 30 is accelerated to a second rotation speed w3, and the second rotation speed w3 is a resonance region of the drum washing machine, that is, the drum washing machine. When the resonance occurs of the drum 30 is preferably smaller than the rotational speed.

This is because the rotational speed of the drum 30 is accelerated at a relatively low rotational acceleration in order to distribute the liquid balancer 50 evenly, unlike the case of rapid acceleration in order to avoid the resonance region in the related art. This is to prevent the resonance region of the washing machine from being included.

However, as described above, after the liquid 54 is evenly distributed along the circumferential direction of the liquid balancer 50 in the first acceleration step S150, the drum 30 is moved to correct the eccentricity again. ) The eccentricity of) increases and decreases, and vibration and noise may occur.

That is, a change in the amount of eccentricity of the drum 30 in accordance with the distribution of the laundry in the drum 30 and the distribution of the liquid in the liquid balancer 50 causes vibration and noise to occur.

If this is not solved and rapid acceleration is performed to avoid the resonance region, the liquid balancer 50 installed to correct the eccentricity does not play a role, but rather, more vibration and noise are induced in the resonance region. This will adversely affect the stability and reliability of the system.

Therefore, the dehydration control method of the drum washing machine according to the present invention maintains the rotational speed of the drum 30 after the first acceleration step S150 while maintaining the second rotational speed w3 within the drum 30. The second eccentric measurement step (S160) of measuring the second measurement eccentricity according to the distribution of the liquid 54 filled in the laundry and the liquid balancer 50 is performed.

In the second eccentric measurement step (S160) while maintaining the rotational speed of the drum 30 at the second rotational speed (w3) for a predetermined time (t5), the Hall sensor (Hall Sensor) installed in the motor 40 ( The amount of variation of the RPM of the motor 40 is detected by using the second measurement eccentricity of the entire drum 30.

Then, the controller (not shown) of the drum washing machine performs a second determination step (S170) of comparing the second measurement eccentricity measured in the second eccentric measurement step (S160) with a preset second reference eccentricity.

That is, comparing the second measurement amount of eccentricity with a preset second reference amount of eccentricity, if less than the second reference amount of eccentricity shifts to the second acceleration step (S180), if larger than the second reference amount of eccentricity to correct the internal eccentricity Then, return to the inflating step (S100) and repeat the above process.

By going through the second eccentric measurement step (S160) and the second determination step (S170) as described above, it is possible to grasp the variation in the amount of eccentricity that may be caused by the flow of the liquid 54 in the liquid balancer 50, and dehydration considering this By forming the algorithm, vibration and noise can be prevented, and the stability and reliability of the system can be secured.

On the other hand, if the second measurement amount of eccentricity is within the allowable range, the process proceeds to the second acceleration step S180. In the second acceleration step S180, the rotation speed of the drum 30 is the first acceleration step ( Rapid acceleration to a rotational acceleration (a2) having a value larger than the rotational acceleration (a1) in S150.

This is to quickly avoid the area with high vibration and noise by increasing the rotational speed of the drum 30 to the rotational speed w4 through which the laundry is dewatered through the resonance region in the shortest possible time.

When the rotational speed of the drum 30 reaches the rotational speed w4, a normal dehydration step (S190) of dehydrating the laundry while maintaining the rotational speed (w4) is performed, and the normal dehydration step (S190). After this, the dehydration administration ends.

6 is a flowchart illustrating a dehydration control method of a drum washing machine according to another embodiment.

Referring to FIG. 6, other steps are the same as in the above embodiment, and in the second determination step S170, when the second measurement eccentricity is greater than a second reference eccentricity, the operation does not return to the inflating step S100. Returning to the position correction step S130, the subsequent process is repeated.

In most cases, the second measurement amount of eccentricity has a smaller value than the first measurement amount of eccentricity and is balanced with the position correction step S130 even if the second measurement eccentricity is performed again from the position correction step S130 without starting from the inflation step S100. This is because the eccentricity is likely to be corrected through step S140.

In addition, the case where the second measurement amount of eccentricity is larger than the second reference eccentricity is divided in detail, and when the second measurement amount of eccentricity is equal to or less than a predetermined value, the process returns to the position correction step S130, and when the value is greater than or equal to the predetermined value, the folding step S100 is performed. You could also form an algorithm to run.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to various modifications and changes to the present invention without departing from the spirit and scope of the invention described in the claims described below You can do it. Therefore, it should be seen that all modifications included in the technical scope of the present invention are basically included in the scope of the claims of the present invention.

According to the dehydration control method of the drum washing machine according to the present invention, it is possible to secure more accurate eccentric information in consideration of not only the eccentricity caused by the laundry inside the drum, but also the eccentricity generated by the flow of the liquid inside the liquid balancer. And, by providing a dehydration algorithm that can be prepared for this, it can contribute to maintaining the stability and reliability of the system.

In addition, by separating the acceleration step for distributing the liquid inside the liquid balancer and the acceleration step for avoiding the resonance region, it is possible to effectively prevent vibration and noise.

Claims (9)

A first eccentric measurement step of measuring an eccentric amount of laundry in the drum while rotating the drum at a first rotational speed; A first acceleration step of accelerating the rotational speed of the drum to distribute the liquid balancer installed in the drum evenly; A second eccentricity measuring step of measuring an eccentricity according to the distribution of the laundry filled in the drum and the liquid filled in the liquid balancer while rotating the drum at a second rotational speed; A second acceleration step of accelerating the rotational speed of the drum for dewatering; And Dehydration control method of a drum washing machine comprising a normal dehydration step of performing a dehydration of the laundry while rotating the drum at a predetermined rotational speed. The method of claim 1, Before the first eccentric measurement step, the dehydration control method of the drum washing machine, characterized in that further comprising the step of unfolding the tangled laundry. The method of claim 2, Between the first eccentricity measuring step and the first acceleration step, determining whether to move to the first acceleration step or to return to the inflating step according to the magnitude of the eccentricity measured in the first eccentricity measuring step Dehydration control method of the drum washing machine characterized in that it further comprises a determination step. The method according to any one of claims 1 to 3, The first acceleration step is a dehydration control method of the drum washing machine, characterized in that for accelerating the rotational speed of the drum up to the second rotational speed. The method of claim 4, wherein And the second rotation speed is smaller than the rotation speed of the drum when resonance occurs in the drum washing machine. The method according to any one of claims 1 to 3, The rotation acceleration of the drum in the second acceleration step is greater than the rotation acceleration of the first acceleration step, characterized in that the dehydration control method of the drum washing machine. The method of claim 2 or 3, Between the second eccentricity measuring step and the second acceleration step, determining whether to move to the second acceleration step or return to the inflating step according to the magnitude of the eccentricity measured in the second eccentricity measuring step Dehydration control method for a drum washing machine characterized in that it further comprises a two judgment step. The method of claim 3, wherein And a position correction step of correcting a position of the laundry eccentric between the first determination step and the first acceleration step. The method of claim 8, Between the second eccentricity measuring step and the second acceleration step, determining whether to move to the second acceleration step or to return to the position correction step according to the magnitude of the eccentricity measured in the second eccentricity measuring step; Dehydration control method for a drum washing machine characterized in that it further comprises a two judgment step.

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